Essential Characteristics of Life Quiz

Viruses make the definition of life difficult because they replicate only in host cells, blurring the distinction between living and non-living matter.

Some of the harsh environments occupied only by extremophiles include extreme heat, acidity, or salinity, as well as deep-sea hydrothermal vents.

Life exists all over the Earth in air, water, and soil, with many ecosystems forming the biosphere.

<p>Life originated at least 3.5 billion years ago, resulting in a universal common ancestor.</p> Signup and view all the answers